I'm very new to this and have a question i can't seem to find an answer on.I have an LED aquarium project where strings of LED's are controlled by buckpacks / drivers. My drivers accept a 0-5V pwm input.Each of these drivers accept an PWM input to control the output current.

My problem is, I have a lot of drivers.

Can i split a single PWM output from my Arduino Mega to drive two or three LED drivers? Or will this affect the 0-5v signal the pwm output each driver would receive if i was try and run more than one driver off one pwm output?

Yes in theory you can do this. The only thing you have to watch is the current each driver takes. Do not exceed about 30mA in total for the direct connection from any one pin.At the worst you will need a buffer chip, but you should be OK.

Use a 74HC04, these are inverting buffers and you get 6 in one package. If you use one per output then the signal is upside down so all you need to do is write 255-value to it. However you can use two in line if you want the signal the right way up. One arduino output will drive 20 buffer inputs.

I'm very new to this and have a question i can't seem to find an answer on.I have an LED aquarium project where strings of LED's are controlled by buckpacks / drivers. My drivers accept a 0-5V pwm input.Each of these drivers accept an PWM input to control the output current.

Can i split a single PWM output from my Arduino Mega to drive two or three LED drivers? Or will this affect the 0-5v signal the pwm output each driver would receive if i was try and run more than one driver off one pwm output?

It depends on the driver but you can almost certainly do more than 1. More than about 10? You might need to use a transistor to amplify the signal.

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

I would follow fungus' sensible questions / suggestions. You will need to know what "drivers" and how many such "drivers" you are dealing with. I would suspect that they don't take much current to drive but it is never wise to assume.

To be save, put a small resistor (1k for example) between the mega's output pin and all the drivers' input pins to see if that will work, if you cannot find the spec for the drivers.

I'm planning on running a maximum of 2 drivers off one single pwm output.So will I need a buffer?

As the PWM is a logic level input signal to the drivers I would think you would have no problems driving two such input pins with an arduino output pin, AVR output pins are quite strong compared to standard TTL output drive standards.

I have the spec sheet for the drivers however there's no mention about the current draw on the pwm input.

What you can't be certain of is if two different drivers will track identically over the 0-100% PWM range. That is a 50% PWM output may not give you 50% brightness when using two different driver modules wired to their LEDs. You can only try it and see if that might be a visual problem or not.